diff --git a/software/firmware/source/SoftRF/src/driver/RF.cpp b/software/firmware/source/SoftRF/src/driver/RF.cpp
index 53b851d10..92b6fcef2 100644
--- a/software/firmware/source/SoftRF/src/driver/RF.cpp
+++ b/software/firmware/source/SoftRF/src/driver/RF.cpp
@@ -1119,6 +1119,11 @@ static bool sx12xx_transmit()
     os_setCallback(&sx12xx_txjob, sx12xx_tx_func);
 
     unsigned long tx_timeout = LMIC.protocol ? (LMIC.protocol->air_time + 25) : 60;
+
+#if defined(USE_SOFTSPI)
+    tx_timeout += tx_timeout;
+#endif
+
     unsigned long tx_start   = millis();
 
     while (sx12xx_transmit_complete == false) {
diff --git a/software/firmware/source/SoftRF/src/platform/RA4M1.cpp b/software/firmware/source/SoftRF/src/platform/RA4M1.cpp
index 56fb28c3a..de3e61ff6 100644
--- a/software/firmware/source/SoftRF/src/platform/RA4M1.cpp
+++ b/software/firmware/source/SoftRF/src/platform/RA4M1.cpp
@@ -80,13 +80,18 @@ const char *RA4M1_Device_Manufacturer = SOFTRF_IDENT;
 const char *RA4M1_Device_Model = "Academy Edition";
 const uint16_t RA4M1_Device_Version = SOFTRF_USB_FW_VERSION;
 
-#if defined(ARDUINO_UNOR4_WIFI)
+#if defined(ARDUINO_UNOR4_WIFI) && (__GNUC__ <= 7)
 #include "ArduinoGraphics.h"
 #include "Arduino_LED_Matrix.h"
 
 ArduinoLEDMatrix matrix;
 #endif /* ARDUINO_UNOR4_WIFI */
 
+#if defined(USE_SOFTSPI)
+#include <SoftSPI.h>
+SoftSPI RadioSPI(SOC_GPIO_PIN_MOSI,SOC_GPIO_PIN_MISO, SOC_GPIO_PIN_SCK);
+#endif /* USE_SOFTSPI */
+
 static void RA4M1_setup()
 {
   if (1U == R_SYSTEM->RSTSR0_b.PORF) /* Power on Reset */
@@ -139,7 +144,7 @@ static void RA4M1_setup()
   for (int i=0; i < 20; i++) {if (Serial) break; else delay(100);}
 #endif
 
-#if defined(ARDUINO_UNOR4_WIFI)
+#if defined(ARDUINO_UNOR4_WIFI) && (__GNUC__ <= 7)
   matrix.begin();
   matrix.beginDraw();
 
@@ -449,7 +454,9 @@ static void RA4M1_EEPROM_extension(int cmd)
 
 static void RA4M1_SPI_begin()
 {
+#if !defined(EXCLUDE_NRF905) || defined(USE_OGN_RF_DRIVER)
   SPI.begin();
+#endif
 }
 
 static void RA4M1_swSer_begin(unsigned long baud)
diff --git a/software/firmware/source/SoftRF/src/platform/RA4M1.h b/software/firmware/source/SoftRF/src/platform/RA4M1.h
index 0fcf9f9e3..59107eab1 100644
--- a/software/firmware/source/SoftRF/src/platform/RA4M1.h
+++ b/software/firmware/source/SoftRF/src/platform/RA4M1.h
@@ -103,6 +103,12 @@ struct rst_info {
 #define SOC_GPIO_PIN_SCK      PIN_SPI_SCK
 #define SOC_GPIO_PIN_SS       PIN_SPI_CS
 
+#include <SoftSPI.h>
+extern  SoftSPI RadioSPI;
+#undef  SPI
+#define SPI                   RadioSPI
+#define USE_SOFTSPI
+
 /* NRF905 */
 #define SOC_GPIO_PIN_TXE      SOC_UNUSED_PIN
 #define SOC_GPIO_PIN_CE       SOC_UNUSED_PIN
diff --git a/software/firmware/source/libraries/SoftSPI/SoftSPI.cpp b/software/firmware/source/libraries/SoftSPI/SoftSPI.cpp
index d2e7e5be7..9f89a8a91 100644
--- a/software/firmware/source/libraries/SoftSPI/SoftSPI.cpp
+++ b/software/firmware/source/libraries/SoftSPI/SoftSPI.cpp
@@ -2,7 +2,8 @@
 
 #if defined(ARDUINO_ARCH_NRF52)
 SoftSPI::SoftSPI(uint8_t mosi, uint8_t miso, uint8_t sck) : SPIClass(NRF_SPIM0, 0, 0, 0)
-#elif defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_ARCH_RP2040)
+#elif defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_ARCH_RP2040) || \
+      defined(ARDUINO_ARCH_RENESAS)
 SoftSPI::SoftSPI(uint8_t mosi, uint8_t miso, uint8_t sck) : SPIClass()
 #else
 #error "This build architecture is not supported!"
@@ -133,10 +134,10 @@ void SoftSPI::endTransaction(void)
 {
 }
 
-#if defined(ARDUINO_ARCH_RP2040)
+#if defined(ARDUINO_ARCH_RP2040) || defined(ARDUINO_ARCH_RENESAS)
 /* compatibility with Arduino RP2040 Core */
 void SoftSPI::usingInterrupt(int interruptNumber) {}
 void SoftSPI::notUsingInterrupt(int interruptNumber) {}
 void SoftSPI::attachInterrupt() {}
 void SoftSPI::detachInterrupt() {}
-#endif /* ARDUINO_ARCH_RP2040 */
+#endif /* ARDUINO_ARCH_RP2040 || ARDUINO_ARCH_RENESAS */
diff --git a/software/firmware/source/libraries/SoftSPI/SoftSPI.h b/software/firmware/source/libraries/SoftSPI/SoftSPI.h
index 19eebe412..5037371da 100644
--- a/software/firmware/source/libraries/SoftSPI/SoftSPI.h
+++ b/software/firmware/source/libraries/SoftSPI/SoftSPI.h
@@ -24,13 +24,13 @@ class SoftSPI : public SPIClass
     // Transaction Functions
     void beginTransaction(SPISettings settings);
     void endTransaction(void);
-#if defined(ARDUINO_ARCH_RP2040)
+#if defined(ARDUINO_ARCH_RP2040) || defined(ARDUINO_ARCH_RENESAS)
     /* compatibility with Arduino RP2040 Core */
     void usingInterrupt(int interruptNumber);
     void notUsingInterrupt(int interruptNumber);
     void attachInterrupt();
     void detachInterrupt();
-#endif /* ARDUINO_ARCH_RP2040 */
+#endif /* ARDUINO_ARCH_RP2040 || ARDUINO_ARCH_RENESAS */
 private:
     uint8_t _miso;
     uint8_t _mosi;
diff --git a/software/firmware/source/libraries/arduino-lmic/src/hal/hal.cpp b/software/firmware/source/libraries/arduino-lmic/src/hal/hal.cpp
index 4fc4f8d3a..44ba66434 100644
--- a/software/firmware/source/libraries/arduino-lmic/src/hal/hal.cpp
+++ b/software/firmware/source/libraries/arduino-lmic/src/hal/hal.cpp
@@ -21,6 +21,13 @@
 #include <cc13xx/cc13xx.h>
 #endif /* ENERGIA_ARCH_CC13XX || ENERGIA_ARCH_CC13X2 */
 
+#if defined(ARDUINO_ARCH_RENESAS)
+#include <SoftSPI.h>
+extern  SoftSPI RadioSPI;
+#undef  SPI
+#define SPI RadioSPI
+#endif /* ARDUINO_ARCH_RENESAS */
+
 #include "../lmic.h"
 #include "hal.h"
 #include <stdio.h>